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Processes controlling the authigenic 10Be/9Be ratio in the Arctic Ocean.

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Title: Processes controlling the authigenic 10Be/9Be ratio in the Arctic Ocean.
Authors: Ollive, A.1 (AUTHOR) agathe.ollive@awi.de, Geibert, W.1 (AUTHOR), Matthiessen, J.1 (AUTHOR), Alscher, M.1 (AUTHOR), Frank, M.2 (AUTHOR), Lachner, J.3 (AUTHOR), Stübner, K.3 (AUTHOR), Adolphi, F.1,4 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Mar2026, Vol. 416, p305-318. 14p.
Subjects: Beryllium isotopes, Paleoceanography, Sea ice drift, Isotopes, Marine sediments, Arctic climate, Sediment transport
Geographic Terms: Arctic Ocean, Arctic regions, Laptev Sea (Russia), Kara Sea (Russia)
Abstract: The authigenic 10Be/9Be ratio in marine sediments is a promising proxy for reconstructing Arctic paleoceanography, particularly the mixing of riverine and marine inputs which differ in their 10Be/9Be by an order of magnitude. This study examines the modern spatial variability of authigenic 10Be/9Be ratios in surface sediments from the Kara Sea, the Laptev Sea, and the adjacent deep Eurasian Basin, tracing the changes from river mouths and estuaries to the open ocean. Our results show that sedimentary authigenic 10Be/9Be reflects different inputs: low ratios of riverine origin dominate on the shelves, while values increase toward the deep sea under the influence of waters of North Atlantic origin. However, unlike other pelagic oceanic settings, where authigenic sedimentary 10Be/9Be generally matches the dissolved 10Be/9Be of the water column, Arctic deep-sea sediments display a clear offset, characterized by lower authigenic 10Be/9Be ratios ([1.5 – 3] × 10-8) than expected from the overlying water column ([5–8] × 10-8). We hypothesize that this offset originates from the preservation of preformed Fe-Mn oxides carrying a low riverine 10Be/9Be signal which are efficiently transported via sea-ice to the central Arctic basins. Additional processes, such as depth dependent scavenging efficiencies in the water column and benthic beryllium fluxes from sediments may also contribute to this offset. Our study thus highlights the contribution of preformed phases to the reactive 10Be/9Be in Arctic Ocean sediments. We demonstrate that the relevance of preformed phases is not limited to near-coastal settings (Wittmann et al. 2017), likely due to large fractions of the sediment being transported by sea-ice. These processes likely also apply to other isotope systems measured in authigenic coatings of Arctic Ocean sediments such as radiogenic Nd isotopes. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 191449241
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Processes controlling the authigenic 10Be/9Be ratio in the Arctic Ocean.
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  Data: <searchLink fieldCode="AR" term="%22Ollive%2C+A%2E%22">Ollive, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> agathe.ollive@awi.de</i><br /><searchLink fieldCode="AR" term="%22Geibert%2C+W%2E%22">Geibert, W.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Matthiessen%2C+J%2E%22">Matthiessen, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alscher%2C+M%2E%22">Alscher, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Frank%2C+M%2E%22">Frank, M.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lachner%2C+J%2E%22">Lachner, J.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Stübner%2C+K%2E%22">Stübner, K.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adolphi%2C+F%2E%22">Adolphi, F.</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Mar2026, Vol. 416, p305-318. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Beryllium+isotopes%22">Beryllium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Paleoceanography%22">Paleoceanography</searchLink><br /><searchLink fieldCode="DE" term="%22Sea+ice+drift%22">Sea ice drift</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopes%22">Isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Marine+sediments%22">Marine sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Arctic+climate%22">Arctic climate</searchLink><br /><searchLink fieldCode="DE" term="%22Sediment+transport%22">Sediment transport</searchLink>
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  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Arctic+Ocean%22">Arctic Ocean</searchLink><br /><searchLink fieldCode="DE" term="%22Arctic+regions%22">Arctic regions</searchLink><br /><searchLink fieldCode="DE" term="%22Laptev+Sea+%28Russia%29%22">Laptev Sea (Russia)</searchLink><br /><searchLink fieldCode="DE" term="%22Kara+Sea+%28Russia%29%22">Kara Sea (Russia)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The authigenic 10Be/9Be ratio in marine sediments is a promising proxy for reconstructing Arctic paleoceanography, particularly the mixing of riverine and marine inputs which differ in their 10Be/9Be by an order of magnitude. This study examines the modern spatial variability of authigenic 10Be/9Be ratios in surface sediments from the Kara Sea, the Laptev Sea, and the adjacent deep Eurasian Basin, tracing the changes from river mouths and estuaries to the open ocean. Our results show that sedimentary authigenic 10Be/9Be reflects different inputs: low ratios of riverine origin dominate on the shelves, while values increase toward the deep sea under the influence of waters of North Atlantic origin. However, unlike other pelagic oceanic settings, where authigenic sedimentary 10Be/9Be generally matches the dissolved 10Be/9Be of the water column, Arctic deep-sea sediments display a clear offset, characterized by lower authigenic 10Be/9Be ratios ([1.5 – 3] × 10-8) than expected from the overlying water column ([5–8] × 10-8). We hypothesize that this offset originates from the preservation of preformed Fe-Mn oxides carrying a low riverine 10Be/9Be signal which are efficiently transported via sea-ice to the central Arctic basins. Additional processes, such as depth dependent scavenging efficiencies in the water column and benthic beryllium fluxes from sediments may also contribute to this offset. Our study thus highlights the contribution of preformed phases to the reactive 10Be/9Be in Arctic Ocean sediments. We demonstrate that the relevance of preformed phases is not limited to near-coastal settings (Wittmann et al. 2017), likely due to large fractions of the sediment being transported by sea-ice. These processes likely also apply to other isotope systems measured in authigenic coatings of Arctic Ocean sediments such as radiogenic Nd isotopes. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2025.12.047
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 305
    Subjects:
      – SubjectFull: Beryllium isotopes
        Type: general
      – SubjectFull: Paleoceanography
        Type: general
      – SubjectFull: Sea ice drift
        Type: general
      – SubjectFull: Isotopes
        Type: general
      – SubjectFull: Marine sediments
        Type: general
      – SubjectFull: Arctic climate
        Type: general
      – SubjectFull: Sediment transport
        Type: general
      – SubjectFull: Arctic Ocean
        Type: general
      – SubjectFull: Arctic regions
        Type: general
      – SubjectFull: Laptev Sea (Russia)
        Type: general
      – SubjectFull: Kara Sea (Russia)
        Type: general
    Titles:
      – TitleFull: Processes controlling the authigenic 10Be/9Be ratio in the Arctic Ocean.
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            – D: 01
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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              Value: 416
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